Synergistic insecticidal compositions

Abstract: Novel insecticidal compositions of the compounds of the formula. wherein R represents hydrogen atom, acyl, alkyl or an optionally substitutable heteroarylalkyl, A represents hydrogen atom, alkyl, or a divalent group connected to B, B represents alkyl, -S-R, or a divalent group or atom connected to A, wherein R has the same meaning as mentioned above, Y represents =N- or wherein T¹ represents hydrogen atom or an optionally substitutable alkyl, and X represents an electron attractive group, and methylenedioxybenzene derivatives.

Description: The present invention relates to a novel insecticidal composition. Synergistically and cooperatively active insecticidal compositions were disclosed in British Patent No. 2,001,852 specification, Belgian Patent No. 861342 specification, French Patent No. 2,396,507 specification. U.S. Patent No. 3,864,388 specification, U.S. Patent No. 4,047,928 specification, U.S. Patent No. 5,153,182 specification, Japanese Patent Application Disclosure No. Sho 58-126803 specification, and so on. Further, it has also been known to some extent that synergistic effect on insecticides can be obtained by using, as adjuvants, phosphates, carbamates, and pyrethroid series compound. It has become a pressing problem, in recent years, to control Thysanoptera represented by Thrips palmi Karny that seriously damages vegetables and flowering plants. Thrips palmi Karny is known to devour tissue of plants, thus hollowing the relevant cellular tissue, bleaching the leaves and, eventually wilting them to wither in case the damage is serious. Thrips palmi Karny is known to seriously damage fruits-bearing plants and vegetables grown by house culture particularly in Kyushu and Shikoku districts. Further, Thysanoptera far easily acquires resistance to commercially available pesticides (insecticide) as compared with other pests, posing a problem of finding a reliable control means to cope with the situation. There has now been found a novel insecticidal composition consisting of 1-(6-chloro-3-pyridylmethyl)-N-nitro-imidazolidin-2-ylideneamine of the formula (I) and piperonylbutoxide. Surprisingly, it has been found that the insecticidal composition according to the present invention exhibits an insecticidal activity far higher than that shown by compound as such represented by the formula (I) and that such a high activity is derived from cooperative and synergistic effects of a combination of two kinds of active components. It has now been confirmed that the insecticidal composition according to the present invention exhibits a very remarkable insecticidal effect against the above-mentioned Thysanoptera. The compound represented by the formula (I) has been known before the filing date of the present patent application. The weight ratios of the active compound couple employed in the present insecticidal composition may be varied within a wide range. In general, use may be made, per 1 part by weight of the compound represented by the general formula (I), of about 1 to 50 parts by weight, preferably about 1 to 25 parts by weight of piperonylbutoxide. The insecticidal active composition according to the present invention exhibits excellent insecticidally active activities, therefore, it is advantageously employed in insecticidal agents in such applications as including foliar application, underwater or submerged application, soil treatment, soil incorporation application, seedling box treatment, stalk injection and planting treatment, etc. The present insecticidal composition exhibits strong insecticidal effects, therefore, it is preferably used as an insecticidal agent. Furthermore, the insecticidal composition according to the present invention has a very low level of phytotoxicity to plants under cultivation and toxicity to warm-blooded animals, so that the present composition can be effectively used for controlling various pests and hygienic insects, particularly insect pests to ensure protection of agricultural products, forestry products, stored crop products, and artifacts. The composition is usually very active on susceptive and resistant seeds throughout or for a certain period of growth stages. Particularly, the insecticidal composition according to the present invention can be employed for effectively controlling Thysanoptera, planthoppers belonging to the order of Hemiptera, especially brown planthopper (Nilaparvata lugens), white-backed planthopper (Sogatella furcifera), smaller brown planthopper (Laodelphax striatellus), leafhoppers, aphis and so on, paddy field insect pests and various insect pests inhabiting various horticultural crop such as fruit trees and vegetables. In addition to the above-mentioned pest controlling, the insecticidal composition according to the present invention exhibits a very remarkable insecticidal activity against such a wide scope of insect pests as shown hereinbelow due to the cooperative and synergistic effect created by the present invention and can be effectively used for controlling the following insects: From the order of Coleoptera, e.g. Callosobruchus chinensis, Sitophilus zeamais, Tribolium castaneum, Epilachna vigintioctomaculata, Agriotes fuscicollis, Anomala rufocuprea, Leptinotarsa decemlineata, Diabrotica spp., Monochamus alternatus, Lissorhoptrus oryzophilus, Lyctus bruneus; from the order of Lepidoptera, e.g., Lymantria dispar, Malacosoma neustria, Pieris rapae, Spodoptera litura, Mamestra brassicae, Chilo suppressalis, Pyrausta nubilalis, Ephestia cautella, Adoxophyes orana, Carpocapsa pomonella, Agrotis fucosa, Galleria mellonella, Plutella maculipennis, Heliothis virescens, Phyllocnistis citrella; from the order of Hemiptera, e.g. Nephotettix cincticeps, Nilaparvata lugens, Pseudococcus comstocki, Unaspis yanonensis, Myzus persicae, Aphis pomi, Aphis gossypii, Rhopalosiphum pseudobrassicas, Stephanitis nashi, Nezara spp., Cimex lectularius, Trialeurodes vaporariorum, Psylla spp.; from the order of Orthoptera, e.g. Blatella germanica, Periplaneta americana, Gryllotalpa africana, Locusta migratoria migratoriodes; from the order of Isoptera, e.g. Deucotermes speratus, Coptotermes formosanus; from the order of Thysanoptera, e.g. Thrips palmi Karny; from the order of Diptera, e.g. Musca domestica, Aedes aegypti, Hylemia platura; Celux pipiens, Anopheles silnensis, Culex tritaeniorthynchus. The insecticidal composition according to the present invention can be formulated into either a mixture of couple of active compounds partners or such an individual form thereof for being ready to be mixed in situ, as conventional formulations, exemplified by such as solutions, emulsions, suspensions, wettable powders, powders, foams, pastes, granules, tablets, solid agents, aerosols, natural and synthetic materials impregnated with active compounds, microcapsules, coating compositions for use on seeds, and formulations used with burning equipment, such as fumigating cartridges, fumigating cans and fumigating coils, as well as ULV cold mist and warm mist formulations. These formulations may be produced in a known manner, for example, by mixing the active compounds with extenders, that is to say liquid or liquefied gaseous or solid diluents or carriers, optionally with the use of surface active agents, that is to say emulsifying agents, dispersing agents, and/or foam-forming agents. In the case of using water as an extender, organic solvents can, for example, also be used as auxiliary solvents. As liquid diluents or carriers may be mentioned, in general, aromatic hydrocarbons, such as xylene, toluene and alkyl naphthalenes, chlorinated aromatic or chlorinated aliphatic hydrocarbons, such as chlorobenzenes, chloroethylenes and methylene chloride, aliphatic or alicyclic hydrocarbons, such as cyclohexane or paraffins, for example, mineral oil fractions, alcohols, such as butanol or glycol as well as their ethers and esters, ketones, such as acetone, methyl ethyl ketone, methyl isobutyl ketone or cyclohexanone, or strongly polar solvents, such as dimethylformamide and dimethylsulfoxide, as well as water. By liquefied gaseous diluents or carriers are meant liquids which are gaseous at normal temperature and under normal pressure, for example, aerosol propellants, such as halogenated hydrocarbons as well as butane, propane, nitrogen and carbon dioxide. As solid diluents there may be used ground natural minerals, such as kaolins, clays, talc, chalk, quartz, attapulgite, montmorillonite or diatomaceous earth, and ground synthetic minerals, such as highly-dispersed silicic acid, alumina and silicates. As solid carriers for granules there may be used crushed and fractionated natural rocks such as calcite, marble, pumice, sepiolite and dolomite, as well as synthetic granules of inorganic and organic meals, and granules of organic materials such as sawdust, coconut shells, maize cobs and tobacco stalks. As emulsifying and/or foam-forming agents there may be used non-ionic and anionic emulsifiers, such as polyoxyethylene-fatty acid esters, polyoxyethylene-fatty alcohol ethers, for example, alkylaryl polyglycol ethers, alkylsulfonates, alkylsulfates, arylsulfonates as well as albumin hydrolysis products. Dispersing agents include, for example, lignin sulfite waste liquors and methyl cellulose. Adhesives such as carboxymethyl cellulose and natural and synthetic polymers, (such as gum arabic, polyvinyl alcohol and polyvinyl acetate) can be used in the formulations in the form of powders, granules or emulsifiable concentrations. It is possible to use colorants such as inorganic pigments, for example, iron oxide, titanium oxide and Prussian Blue, and organic dyestuffs, such as alizarin dyestuffs, azo dyestuffs or metal phthalocyanine dyestuffs, and trace elements, such as salts of iron, manganese, boron, copper, cobalt, molybdenum and zinc. The formulations, for example, contain from 0.1 to 95 percent by weight of active compound, preferably from 0.5 to 90 percent by weight. The insecticidal composition of the present invention can be used as such, as commercially useful formulations or as the use forms prepared therefrom, optionally together with other active agents such as, for example, insecticides, poisonous baits, bactericides, acaricides, nematicides, fungicides, growth regulators or herbicides. Examples of the pesticides include, e.g., those derived from organic phosphates, carbamates, carboxylates chlorohydrocarbons, carboxylates and antibiotic products. The content of the insecticidal composition of the present invention in the formulations of the types that are commercially available can vary within a substantially wide range, that is, from about 0.00001 to 100 percent by weight, preferably from 0.001 to 1 percent by weight. The insecticidal composition according to the present invention may be used in conventional manners adapted to the particular formulations. When used against pests harmful to health and pests to stored products, the active compounds are distinguished by an excellent residual activity on wood and soil as well as a good stability to alkali on limed substrates. The present invention will be further explained by way of examples. However, it should be noted that the scope of the present invention is not limited onto to what is stated in the examples. [Example] Test Example 1 Insecticidal test on Thrips palmi Karny Compounds under test No. 1: 1-(6-chloro-3-pyridylmethyl)-N-nitro-imidazolidin-2-ylideneaminde, PB: Piperonyl butoxide Preparation of test formulation: Solvent: 3 parts by weight of xylene Emulsifier: 1 part by weight of polyoxyethylene-alkylphenyl-ether To prepare suitable formulations of active compounds, 1 part by weight of each of the active compounds was mixed with the above-mentioned amount of the emulsifier, and the mixture was diluted with water to the predetermined concentration. Test Method: The present method was aimed at preventing the flight and propagation of Thrips palmi Karny from one place to the other under the activity of the present insecticidal compositions. As the test plant were used eggplants (Senryo No. 2 variety). To unglazed pottery basins each having a diameter of about 15 cm were planted seedlings of eggplants with from four to five open leaves and, one week before the spraying of the insecticidal compositions thereonto, the adult insects were inoculated thereto, which in turn means that at the moment of spraying of the insecticidal compositions were already present Thrips palmi Karny of all the growth stages of from eggs to adults not only in and on the plant bodies but also in the soil. In the test, one district consisted of three basins. Immediately before the spraying, the total number of the insects were counted under classification between adults and larvae. The spraying of the insecticidal compositions was carried out with the use of a spraying gun such that 100 ml of each of the insecticidal compositions was applied to three seedlings until the leaf surfaces thereof were moistened sufficiently with each of the formulations at varying concentrations that had been prepared according to the procedures stated hereinbefore. Immediately after the spraying, each of the basins was covered with a cylindrical glass having a diameter of 15 cm and a height of 35 cm with its lower portion being secured onto the basin with an adhesive vinyl tape and the upper portion being covered with a cotton cloth secured thereto with a rubber band, while it was kept at 20°C thereafter. After two days and seven days, respectively, a survey was carried out to count the total number of the insects, classified under adult insects and larvae, thus obtaining the protective index, that was calculated according to the following equation: Protective index = [1 - ( A B ./. C D )] × 100 wherein A is the number of insects in the treated zone after spraying the insecticidal composition, B is the number of insects in the treated zone before spraying of the insecticidal composition, C is the number of insects in the untreated zone after spraying of the insecticidal composition, D is the number of insects in the untreated zone before spraying of the insecticidal composition. The results are shown in Table 1. Compounds under test Concentrations of active components ppm Protective index after two days Protective index after seven days adult larvae adult larvae No. 1 + PB 50 + 450 100 100 100 100 25 + 225 100 100 100 100 No. 1 50 100 100 98 100 25 70 75 60 70 PB 450 0 0 0 0 Untreated - 0 0 0 0

Claims: Insecticidal compositions, characterized in that they contain synergistic mixed compositions consisting of 1-(6-chloro-3-pyridylmethyl)-N-nitro-imidazolidin-2-ylideneamine of the formula (I) and piperonylbutoxide. Insecticidal composition of claim 1, characterized in that the weight ratio of the compound of the formula (I) to piperonylbutoxide is between 1:1 and 1:50. Use of the insecticidal compositions of claims 1 or 2 for combating harmful insects. Process for the preparation of insecticidal compositions, characterized in that the insecticidal compositions of claims 1 or 2 are mixed with extenders and/or surface-active agents.

Inventors: KAMOCHI ATUMI, KAWAHARA YUKIO, SAITO IKUYA, TSUBOI SHIN-ICHI, YAMASHITA NOBUHIRO, KAMOCHI, ATUMI, KAWAHARA, YUKIO, SAITO, IKUYA, TSUBOI, SHIN-ICHI, YAMASHITA, NOBUHIRO
Applicants: BAYER AGROCHEM KK, NIHON BAYER AGROCHEM K.K.
Application year: 1994
Main classification: A01N43
IPC codes: A01N43, A01N33, A01N31, A01N37